Gear-cutter.



A. R. MURRAY.

GEAR GUTTER.

INVENTOR l WITNESSES A. R. MURRAY.

GEAR GUTTER.

APPLICATION FILED JUNHZ?. 1907. 1,007,376, Patented oc1.31,1911.

11 SHEETS*SHBET 21 A Harney? COLUMBIA VLANOQRAPH 1:0.,WASHINO'NN. D. c.

A. R. MURRAY.

GEAR GUTTER.

APPLIGATloN FILED JUNE 27. 1907.

1,007, 376. l Patented 0G13. 31, 1911. v

11 SHEETS-SHEET 3.

W/TNESSES l NVENTOR Al/omey( A. R. MURRAY.

GEAR GUTTER.

APPLIOATION FILED JUNE 27.. 1907.

Patented 0013. 31, 1911. 11 SHEETSQSHEBT 4.

A. R. MURRAY.

GEAR GUTTER. APPLIoATIoN FILED JUNE 27, 1907.

Patented 001'.. 31, 1911.

1l SHEETS-SHEET 6.

COLUMBIA PLANDGRAPH Co.. WASHINGTDN, D. c.

A. R. MURRAY.

GEAR, GUTTER.

Patented Oct. 31, 1911.

11 SHEETS-SHEET 6.

Allameyl CBLUMBIA PLANOUIAPH C0.WASH1NBTON, D. C.

A. B.. MURRAY.

GEAR CUTTER.

APPLICATION FILED JUNE 27. 1907. 1,007,376, Patented 0111.311911.

11 SHEETS-SHEET 7.

A Harney( INVENTOR fm COLUMBIA FLANOGRAPH co.. WASHINGTON. D. C.

A. R. MURRAY.

*GEAR GUTTER. APPLIOATION .FILED JUNE 2v. 1907.

Patented 0013.31-, 1911.

11 SHEETS-SHEET 8.

[NVE/WOR PMLWI/ Harney WITNESSES a... fw, 7% M COLUMBIA PLANOGRAPH1:0.,WASHINQTON. D. c.

. R. MURRAY.

GEAR GUTTER.

APPLICATION FILED JUNE 27, 1907.

Patented Oct. 31, 1911.

11 SHEETS-SHEET 9.

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INI/ENTOR KM@ @QW ma //arny COLUMNA PLANoan/PM cu.. WASHINGTON, D. c.

A. B.. MURRAY. l

GEAR GUTTR.

APPLIOATLON FILED JUNE 27. 1907.

1 ,007,376. Patented Oct. 31, 1911.

11 SHEETS-SHEET 11.v

WJTNESSES.- INVENTOR g.. /f/M,

@W WW EOLUMBIA PLANOnRAN-x cu., WASHINGTON, D. c

'UNITED STATES! PATENT OFFICE ARISTIDES REYNOLDS IVIURRAY, 0FCINCINNATI, OHIO, ASSIGNOR TO THE CINCINNATI SHAPER CO., OF CINCINNATI,OHIO.

GEAR-CUTTER.

Specification of Letters Patent.

Patented Oct. 31, 1911.-

Applcaton le. June 27, 1907. Serial No. 381,032.

To all whom it may concern:

Be it known that I, ARIsTrDns REYNOLDS MURRAY, a citizen of the UnitedStates, residing at Cincinnati, in the county of Hamilton and State ofOhio, have invented new and useful Improvements in Gear-Cutters, ofwhich the following is a specification.

The invention relates to gear cutters and especially to automaticmachines for cutting spur gears. Many of the features of the machine arehowever adapted for use in cutting other forms of gears, and also inmilling machines not intended especially for gear-cutting, and in othermachine tools, as will be understood by those versed in the art.

Among the objects of the invention are to provide a simplied arrangementof shafts and gears for driving the various parts of the machine; toprovide readily accessible groups of gearing for the cutter-feed andindex mechanism; to provide means for readily changing the gear ratio atthese points; to provide in the indexing mechanism readily adjustablemeans for controlling the movement of the blank in indexing withoutdisturbing the main blank-rotating gearing; to provide a novel form offeed-- controlling lever, and a new and very positive safety-stopcoacting with the indexing mechanism and feed lever.

The invention further consists in new and improved constructionthroughout the machine, as will later appear.

The drawing illustrates the best exemplification of the invention whichI have at this time devised, but itis to be understood that otherexemplifications are contemplated within the scope of the invention.

Figures 1 and 2 join on the line A-A, and constitute a view, partly inplan and partly in section, of a machine embodying the invention, Fig. 1showing the forward or feed end of the machine, and Fig. 2 the rear end.Fig. 1a is a detail in section on the line 1a 1a,

Fig. 1. Fig. 3 is a front end elevation, the.

upper part of the blank column being omitted. Figs. 4, 5 and 6, of whichFigs. 4 and 5 join on the line BB (the lines identified by literalcharacters designating planes which are the same in all views), andFigs. 5 and 6 join on the line C-C, together constitute a completeright-hand view of the machine, partly in elevation and partly in andlatch therefor; Fig. 8 a left side elevation of the blank column; Fig. 9a condensed rear view, principally in elevation, but partly in section,showing the upper and lower parts of the machine brought close together,the splined worm-shaft being broken for that purpose; Fig. 10 a planView of the index and stop mechanism; Fig. 11 a side elevation of thesame; Fig. 12 a rear view of the same, partly in section; Fig. 13 a viewfrom the left on plane D-D, Fig. 12; Fig. 14 a front sectionaldiagrammatic view of the reversing lever and safety-stop; Fig. 15 asection longitudinally through the cutter spindle; Fig. 16 an end Viewof Fig. 15, showing the transverse cutter carrier; Fig. 17 a detail insection looking downward of the movable support for holding the indexworm in engagement with the wormwheel; Fig. 18 a view of the mechanismof Fig. 17, taken from the left side of the machine; Fig. 19 a detail ofa part of the worm-adjusting mechanism.; Fig. 20 a transverse sectionthrough the base and cutter slide showing the guides; and Fig. 21 a planof the slide with the cutter, cut-ter arbor, spindle, etc., removedshowing the adjustable gib.

General arrangemen-Reference numeral 1 designates the base of themachine. which carries at the rear end a column 2 supporting the blankarbor. Shaft 3 reaches across the machine near the front end and issuitably journaled in the frame. Pulley 4 keyed to shaft 3 at the righthand side of the machine furnishes the power drive for the wholemechanism. The cutter-slide 5 is mounted on suitable guides to movelongitudin ally of the frame. Near the front or feed end a box 6 issecured to the base which incloses the feed clutches and reversinglever.

Words indicating position, such as horizontal, vertical, etc., are usedin a relative sense only. By defining definite positional relations ofparts in the exempliication shown and described it is not intended tolimit construction to such arrangements. Changes in position of parts aswell as other changes, may be made without departing from the invention.lords denoting direction, as front, rear, right-hand, etc., are usedwith reference to a supposed observer standing at the feed end of themachine.

Gutter, slid/e cmd cutter drive-Main shaft 3 carries a bevel gear 7engaging bevel gear 8 keyed to shaft 9 which is journaled in sleeve 10carried by the base. Gears 7, 8, are inclosed in a gear box 11 formed inthe base which may be open at the top or covered. A pinion 12 is securedto the shaft 9 at the front end. Cutter drive shaft 13 is journaled atits forward end in sleeve 14 above shaft 9 and carries gear 15 engagingpinion 12. Pinion 12 and gear 15 are keyed to their respective shaftsand secured by nuts 16 and washers 17 so that they may be removed andreplaced by other sized gears to change the relative speeds of shafts 9and 13. Gears 12 and 15 as well as other gears at the feed end of themachine are inclosed by guard 18 surrounding the peripheries of thevarious gears.

The rear end of shaft 13 revolves in bearings formed in a housing 19fixed to the cutter slide. The rear bearing 20 consists of a bush fixedin the housing and the forward bearing 21 is a removable bush having anoutside diameter equal to that of the worm and screwed or otherwisesuitably secured in the housing. The worm 22 is mounted and splined onshaft 13 between bearings 20, 21, so that it is free to movelongitudinally on the shaft as the slide reciprocates but turns with theangular movement of the shaft. A thrust collar 23 is interposed betweenthe worm and the rear bearing member 20 to take up the thrust of theworm.

The hollow cutter spindle 24 is revolubly mounted transversely of themachine and above shaft 13 in sleeve 25. The sleeve is operativelyintegral with a base 26 having beveled edges 27 and the sleeve with itsbase forms a slide movable transversely on the cutter slide proper. Thebeveled base rests on a flat face of the cutter slide between a fixedguide 28 and movable gib 29 which rests between a transverse shoulder 30on the cutter slide and transverse slide 26. Screws 31 serve to tightenor loosen the movable gib and so to secure or free the transverse slide.Spindle 24 bears near its right hand end a collar 32 splined to it andis tapered at its left hand end to fit a corresponding taper in sleeve25. By means of nuts 33 engaging a screw thread on the spindle andbearing against collar 32 the spindle may be drawn to the right inrelation to sleeve 25 to take up wear. Worm wheel 34 engaging worm 22 issplined to collar 32 so as to have slight longitudinal movement thereonand is carried in a housing 35, fixed in relation to the cutter slide,with its hub between annular or partly-annular shoulders 36 formed inthe housing which serve to hold the worm wheel stationary on the slideexcept for its rotary motion.

Cutter arbor 37 has a tapered right hand end 38 fitting in the taperedportion of the bore of spindle 24 and is secured to the spindle by bolt39, whose flange 40 engages the end of the spindle, and lock nut 41screwed on the end of the spindle and engaging flange 40. Arbor 38carries a flange 42 and a cutter 43 is mounted and splined on the arboradjacent to the flange. The rough adjustment of the cutter is effectedby placing one or more collars 43a of .suitable sizes between it and theflange, and if necessary on the other side of the cutter, these collarsand the cutter being forced together and against the flange by sleeve 44surrounding the arbor and engaged by nut 45 screwed upon the leftend ofthe arbor'. The left end of the arbor is supported, if necessary, by abearing 46 carried on a transverse slide 47 which may be similar toslide 26, already described, and similarly secured by a guide 48, andgibs 49, and other parts respectively simi-lar to members numbered 28,29, etc., already described in connection with slide 26. By looseninggib 49, slide 47 may be removed from the cutter slide, permitting theremoval of the cutter and related parts.

rlChe fine adjustment of the cutter is effected as follows: Thetransverse slide 26 carries a lug 50 through which screw 51 secured tohousing 35 passes loosely. Nuts 52, one on each side of the lug, engagethe screw and by turning the nuts sleeve 25, the spindle and arbor 37with the cutter' are moved bodily to the right or left, this movementbeing permitted by the splined connection of collar 32 with the hub ofworm wheel 34. When the adjustment of the cutter has been effected,screws 31 are tightened, forcing movable gib 29 against transverse slide26, and locking it in position.

The top of the main frame or base is provided with two guide rails 53(see Figs. 2() and 21) having vertical surfaces for guiding the cutterslide. The left-hand rail guides the slide laterally. At the left sidothe slide has two longitudinal flanges 54, embracing the left-hand rail.Surface 54L of one of the flanges is at a slight angle to thelongitudinal axis of the slide and adjustable tapered gib 55 is carriedbetween this surface and the guide rail. The gib is adjusted in relationto the slide by screws 55a engaging the slide and whose heads engage theends of the gib. By this means the gib is adjusted so as to make a closesliding fit between the guide rail and the flanges. At its righthandedge the slide has another longitudinal flange 54b between which and theadjacent guide rail a clearance is provided. Clamps 56 bolted to flanges54, 54b engage the under sides of the guide rail and prevent the slidefrom rising.

The peculiar L-shape of the slide is important. It permits making theleft-hand side of the slide, the rear end of which moves to the rear ofthe work column, very long, with long guiding surfaces. The right-handside is shorter so that it does not encounter the column. Thisconstruction allows a great travel of the cutter slide on a relativelyshort base and also provides a narrow guide of great length, reducingthe binding tendency of the slide to a minimum.

Cutter feed, gearing and clutch- Feed shaft 59 passes through feed box 6and is journaled in suitable bearings in the front and rear of the box,and bears the feed screw, 60, which engages a nut secured to the bottomof the cutter slide. A collar 6l pinned to the feed shaft engages shaftbearing 62 and takes up the feed thrust of the screw. Forward of bearing62 feed-clutch 63 is revolubly mounted on shaft 59 and the cutterfeedworm-wheel 64 is keyed on this clutch.

At its left hand end main shaft 3 carries gear 65 outside the base,inclosed by a guard 66 which also incloses other gears belonging to thefeed drive. Transverse shaft 67 passes through the feed box and projectstherefrom at the left through an extended cylindrical bearing 68 and atits outer end carries gear 69. A quadrant 70 having its hub 71 pivotallymounted on the projecting bearing 68 bears a stud 72 carrying doublepinions 73, 74, the first engaging gear 65 and the second, gear 69 sothat the transverse shaft 67 is driven from main shaft 3 through gears65, 73, 74, 69. By removing double pinions 75, 74 and gear 65 andreplacing these with gears and pinions of different sizes the ratio ofspeed of shaft 67 to that of shaft 3 may be varied. Quadrant 70 is swungon bearing member 68 as a pivot to bring pinion 73 into proper mesh withwhatever size gear 65 is used and locked in adjusted position by meansof nut 75 engaging slotted segment 76 of the quadrant. Transverse shaft67 is suitably journaled in the base and passes through the feed boxbelow the feed wormwheel. The feed worm 77 engages the worm wheel and iskeyed on shaft 67 between stationary bearing members, which restrain theworm from end motion.

Shaft 9, which, as above described, is driven from the main shaft, bearsa gear 80 engaging gear 81 on index drive shaft 82; gear 81 in turnengages idle gear 83 on stud 84 and gear 83 engages gear 85 which is thedriving gear for retracting the cutter. Gear 85 is mounted revolublyupon a flanged collar 86 keyed to sleeve 87, which is revoluble on therear end of the feed shaft 59 and in turn revolves within the forwardbearing member 88 of said shaft. Flange 86a of collar 86 has one or moresockets 89 into which project lugs 90 of corresponding number, carriedby gear 85. Interposed between the lugs and the adjacent faces ofsockets 89 in the direction of drive are elastic fillers 91,conveniently of raw hide, which deaden the shock of engagement of thereverse feed drive which would otherwise be considerable, owing to therelatively high gear ratio at which the cutter is retracted from thework. Near its front end feed shaft 59 is screw-threaded, and nuts 92engaging t-he thread bear against collar 86 serving to draw the shaft tothe left in relation to the collar. This urges the collar intoengagement with the desired closeness with the forward face of bearing88 and at the Same time draws thrust collar 61 against the rear face ofbearing 62. Collar 86 and nuts 92 thus take up the thrust of the feedscrew during the retracting movement.

Sleeve 87, as has been said, extends through bearing 88, and to the rearof the bearing reverse clutch member 93 is keyed to it. Between forwardclutch member 63 and reverse clutch member 93 a sleeve 94 is keyed toshaft 59 and on this sleeve is splined the double reversing clutchmember 95, having teeth ateach end to engage the teeth of clutch members63 and 96. Vhen the reverse clutch is in position shown in Fig. 1, thatis, in engagement with clutch member 63, the feed worm wheel 64 isevidently connected revolubly with the feed screw, and when thereversing clutch 95 is in its rearward position engaging clutch member93, reverse gear 85 is connected revolubly with the feed screw.

The operation of the gearing for forward and reverse feed is obviousfrom the foregoing description of relation of the parts.

Field clutch operating mechanism, (referring to Figs. 1, 4, 10 and14.)-Pivoted on a stud 96 in the feed box is the reversing lever 97,forked at 98 to embrace the reversing clutch, and having fingers orrollers 99 engaging an annular groove 100 in the clutch. Pivoted tolever 97 at 101 is a rocking lever 102 called, for convenience, simply arocker, having projections 103 adapted to engage correspondingprojections 104'on the reversing lever to stop relative movement of therocker in relation to the lever at the proper points. At its end awayfrom the reversing lever, rocker 102 carries a roller 105 constituting acam-follo-wer engaging the centrally peaked cam 106. This cam is carriedby a plunger 107 reciprocating in a socket 108 and pressed outwardly bya spring 109 confined in the socket by a cap-screw 110. To retain thereversing clutch in an intermediate position and free from either theforward or reverse feed clutch members a latch 97 a is pivoted to theleft side of the feed boX 6. The latch is provided with a hook 97badapted to engage lever 97 as shown in Figs. 7 and 7a.

Mounted reciprocably in suitable bearings below the rocker and cutterslide is a reversing rod or clutch shifter 111 which carries upwardlyprojecting lugs 112 separated a suitable distance, one on each side of alug 113 depending from rocker 102. Rod 111 carries two dogs 114adjustable on the rod by means of screws 115 wit-hin the range ofmovement of the cutter slide and the slide carries a tappet 116 movingbetween dogs 114. The tappet eXtends through a socket in the slide andis provided at the top with a knurled head 117 carrying a pin 118projecting downwardly into a hole drilled in the slide to receive it. Aspring 119 surrounding the tappet within its socket and bearing againstfiange 120 on the tappet urges the latter downward. By pulling up androtating the knurled head 117, pin 113 is brought into contact with thesurface of the slide and the tappet is thus held in inoperative positionaway from dogs 114 so that, for instance, when the machine is beingadjusted the slide may be moved without affecting the position of thereversing lever, Or shifting the dogs.

Ordinarily, with the tappet in working position, when it encounterseither of the dogs, it moves the dog and rod 111 in the direction ofmovement of the slide. Assuming the parts to be in the position shown inFig. 1, that is with the reversing clutch in engagement with the feedclutch member G3 and the slide moving toward the rear of the machine,reversing rod 111 is moved to the rear causing forward lug 112 carriedby the rod to encounter lug 113 on the rocker. The continued movement ofthe slide causes the rocker to move toward the right as seen in Fig. 1until cam follower 105 passes the crest of dog 106. Leaving out ofconsideration at present the safety stop, which will be later described,the cam, urged by spring` 109, now moves the follower farther to theright until abutment 103 of the rocker encounters corresponding abutment104 on the reversing lever and rotates the reversing lever anticlockwiseon its pivot, retracting the reversing clutch 95 from feed clutch member63, thus stopping the feed, and by continued movement bringing thereversing clutch into engagement with clutch member 93, making thereverse feed effective and retracting the cutter from the work.

Indexing mechanism, (referring to Figs. 4 and 10 to 13d-As has beendescribed, gear 31 is driven by gear 30 on shaft 9 and rotates shaft 82,which has its forward bearing in gear box 13 and extends alongside thebase of the machine to rear bearing 120. Near the bearing the shaftbears the pinion 121. Rear or driven indexing shaft 122 is mounted inits forward end in bearing 123, carried by a bracket 120a secured to thebase, and carries a sleeve 124 keyed to it. rThe sleeve has an annularflange 125 at its rear end, and a flanged sleeve 120 is splined tosleeve 124 near its forward end so that it has longitudinal movement. Asleeve 127 is mounted revolubly on sleeve 124 between flanges 125 and120 and constitutes the driving member of the friction drive. Sleeve 127carries flanges 123, 129, facing fianges 125, 126, respectively, andfriction disks, 130, of leather, raw hide or other suitable material areplaced between t-he driving and driven disks. Spring 131 confinedbetween adjustable nut 132 and the end of the sleeve of disk 126 appliessuitable pressure to the frictionally driven member. Disk 123 carries agear 133 engaging pinion 121 by which the driving member of the frictiongroup is rotated. To the rear of bearing 123, fast stop-disk 134 iskeyed to shaft 122. rllhis disk is provided with one or more notches 135as may be required, one being used in the present eXemplication. Alittle to the rear of disk 134, pinion 136 is keyed to shaft 122 andbetween the pinion and the disk a loose gear 137 having an eX- tendedhub 133, is journaled on the shaft. Keyed to this hub between gear 137and the fast stop-disk 134 are a. first loose stop disk 139 having inthe present exemplitication one notch 140, and a second loose stop-disk141 havingin this exempliication two notches 142. Pinion 136 engages alarger gear 143 revoluble about stud 144, which is equivalent to acounter-shaft, carried by an extension of bracket 120a secured to thebase and gear 143 is keyed to the hub of smaller pinion 146 which inturn engages gear 137 on shaft 122, serving to drive the last-named gearand stop disks 139, 141 keyed to it at a reduced speed in relation tothat of shaft 122.

llo the right of shaft 122 a continuation of bracket 120a provides arear bearing 147 for rock shaft 148, sometimes called the latch shaft.This shaft carries fixed latch 149, whose hub 150 is keyed to the rockshaft and which has a tooth 151 adapted to enter notch 135 in faststop-disk 134. To the rear of fixed latch 149 is a movable latch 152, ofwhich the hub 153 is mounted on rock shaft 148 and splined thereto inthe same plane as latch 149 so that it has longitudinal movement on theshaft. A set screw 154, with knurled head, serves to lock latch 152 inadjusted position on its shaft. Latch 152 has a tooth 105 adapted toenter the notches in loose stop disks 139, 141, depending on theposition of the latch. Rock shaft 143 is urged to rotate in a clockwisedirection as seen in Fig. 12, and thus urges the teeth 151, 155 oflatches 149, 152 to engage the peripheries of the stop disks and toenter the notches in the disks when the notches come opposite the teeth,by a spring 174 which will be later described in connection with thesafety stop.

Above the latches, a stud 156 is fixed to the base and on the stud, bellcrank 157 is pivoted. One arm of the bell crank is connected by a link158 and swiveled fork 159 to fast latch 149. The bell crank bears in asocket in its other arm, a catch 160, urged outwardly by spring 161until checked by collar 162 pinned to the stem of the catch 160 belowthe upper arm of the bell crank. A hook 163 shaped complementally tocatch 160 is fastened to clutch shifting rod 111 to the rear of dogs114.

During the retract-ion of the cutter slide parts are in the positionshown in Figs. 10, 11 and 12. Toward the end of the retracting movementtappet 116 strikes forward dog 114 and moves shiftingl rod 111 forward,and hook 163, engaging catch 160 rotates bell crank 157counter-clockwise as seen in Fig. 11 through a partial arc of a circle,until, by reason of the angular movement of the catch, it becomes freefrom the hook. When the bell crank is moved, through link 158, thelatches 149, 152 are withdrawn from the notches in stop disks 134 and139, or 141 in which they rest. For the moment it will be assumed thatmovable latch 152 is toward the rear end of its shaft and entirely freefrom the stop-disks so that only the fast latch is operative. This latchbeing momentarily pulled up, its tooth 151 is freed from the notch 135in fast stop-disk 134 and the disk, which is being constantly urged torotate by the friction driver, immediately rotates clockwise as seen inFig. 12. As soon as the bell crank is freed from hook 163, it and thelatch return toward their normal positions under the influence of thespring acting on rod 148, and the lower end of tooth 151 encounters theperiphery of disk 134, upon which it rests until the notch againapproaches the tooth whereupon the tooth again enters the notch andstops the disk. Rear indexing shaft 122 rotates or stops with the fastdisk which is keyed to it and through other gearing which will later bedescribed each time the tooth is removed from the notch in fast disk thegear blank is rotated one space.

Toward the end of the feeding movement of the cutter slide tappet 116strikes rear dog 114 and moves clutch shifting rod 111 to the rear,causing hook 163 to pass catch 160 which it depresses as it moves past,bringing the hook and catch again into operative relation ready foranother indexing action.

The indexing gearing, as will later appear, is preferably provided withchange speed elements, which I find it convenient to locate intermediatethe indexing mechanism and the gear blank, in order to provide for allpossible degrees of indexing movement, but the loose stop disks andmovable latch, as will now be shown, provide convenient means forvarying the movement of the blank arbor without disturbing the mainchange speed gearing. For purposes of illustration, it will be assumedthat the ratio of gears on shaft 122 and counter-shaftstud 144 is suchthat gear 137 rotates at onequarter the speed of pinion 136. Loose stopdisks 139, 141, therefore, rotate with gear 137 once while fast stopdisk 134 rotates four times. The disks are originally adjusted so thatthe notch in disk 139 is in line with notch in disk 134, and one of thenotches of disk 141 is in line with the notches in the other disks, theother notch in disk 141 being diametrically opposite the first. Thus,during the indexing rotation of shaft 122, the notch in the first loosedisk will coincide with that in the fast disk once in four revolutions,and one of the notches in the second loose disk will coincide with thatin t-he fast disk at every second revolution. In order to obtain arelatively small indexing movement, the movable latch 152 is placed ashas been described, free from the loose disks. The fast latch thenenters the notch in the fast stop disk at every revolution of thelatter. To secure double this indexing movement, thumb screw 154 isloosened and movable latch 152 moved on shaft 148 until it is above thesecond loose disk 141. Then, at the first revolution of the shaft, tooth151 of fast latch 149 is opposite its notch and ready to enter, buttooth 155 of the movable latch rests on a portion lof the circularperiphery of the loose disk, and since the fast latch moves in unisonwith the movable latch, no tooth is permitted to enter a notch, and theindexing movement continues during another revolution of shaft 122, whenthe notch 142 in the second loose disk other than the notch which hasrecently left the tooth of the movable latch, comes in line with thenotch in the fast disk, the teeth of both latches enter their notchesand indexing is stopped. To secure four times the minimum indexingmovement, the latch is shifted on its shaft until it is over the rstloose disk. Indexing shaft 122 must then rotate four times before it isstopped in a manner which will be obvious from the foregoing descriptionof the action of the second loose disk.

Obviously, the ratios in gearing between pinion 136 and gear 137 may bevaried, the number of loose stop disks may be increased or diminished,and instead of all of the loose less means are taken to prevent it, thecutter slide is sometimes fed toward the blank before the indexingmovement is completed, resulting in spoiling the blank. rlhe safetystop,which is to be described, is provided to prevent this occurrence.

Referring to Figs. l and 14-reversiug lever 97 has an arm 170 extendingto the right of its fulcrum. Below the end of this arm the safety-stop,consisting of a rod 171, is reciprocably mounted in the base. The rodcarries an arm 172 pinned to it normally resting on support 173, andurged downward by a spring 17 4 which is confined between the feed-box Gand the arm. Latch rod 148 is mounted at its forward end in a bearing175 and carries a two-armed lever or bell crank 17 6 which is keyed tothe shaft. The end of arm 177 of this bell crank engages the lower faceof arm 172 on the safety-stop lying between two projections 178, whichprevent disengagement of the arms. It now becomes evident that spring174 is the agent which tends to rotate rock shaft 148 in the mannerbefore described in connection with the indexing mechanism. As clutchshifting rod 111 commences to be moved forward by the slide as thecutter approaches the end of its retracting movement, rear lug 112 onthe front end of the rod engages lug 113 depending from rocker 102 andmoves the rocker forward until cam-follower 105 passes the crest of cam10G. At this moment the cam commences to urge the follower fartherforward until its lug 103 contacts with the corresponding lug on thereversing lever and the action of the cam then tends to urge thereversing lever to move reversing clutch 95 into engagement withfeed-clutch member 03. The forward movement of shifting rod 111 has,however, at the same time rotated bell crank 157, retracted the latch orlatches from the notches in the stop disks, and permitted the indexingmovement to commence. ln moving up from the notches, the latch orlatches rotate rock shaft 148 as has been described and this rotation ofthe shaft throws up arm 177 of bell crank 176, which in turn raises arm172 and the safety-stop 171 against the action of spring 174, so thatthe upper end of the safety-stop projects in the path of the end of arm170 of the reversing lever. The safety-stop is in such a position thatit checks arm 170, and therefore the reversing lever, before the teethof reversing clutch 95 encounter the teeth of feed clutch member 03. Theconditions now are as follows: The cam urges the reversing lever andreversing clutch in the feeding direction; the safety-stop is in thepath of lever arm 170 and prevents movement of the lever to feedingposition; the safety-stop is held in this active position by rock shaft148 and the rock shaft is held in the described position against theaction of spring 174 by conta-ct of the ends of the teeth of the latches(or one of them as the case may be) engaging the circular peripheries oftheir corresponding indexing disk or disks. It is, therefore, obviousthat it is impossible for the cutter slide to be fed forward toward theblank while indexing is in progress. As soon as the determined indexingmovement is completed, the teeth of the latch or latches enter theirnotches, rock shaft 148 is permitted to rotate, safety-stop 171 dropsunder influence of its spring and gravity, freeing arm 170 of thereversing lever, and the lever under influence of the cam completes itsmovement, bringing the reversing clutch into engage-ment with feedclutch member' 03. The slide and cutter are then fed to and through theblank, the reversing lever and clutch are thrown to retracting positionby rearward movement of shifting rod 113 in obvious manner and thesequence of actions continues until the blank is finished. Theconsiderable clearance between lugs 112, which act on the reversinglever, serves to permit return of the shiftinorod to its normal positionafter it has thrown the cam-follower in front of the crest of the camand before the lever is returned to the retracting position.

Ehm/c arbor, mounting cmd gearing-The manner in which driven indexingshaft 122 is impelled has been described. At the rear end of the machinea cylindrical bearing member 180 is bolted to the base providing at itsrear end a bearing 181 for the rear end of the shaft 122. Gear 182 iskeyed and bolted to t-he rear end of shaft 122. A bracket 183 bolted tothe base above shaft 122 carries indexing countershaft 184 which hasgear 185 keyed and bolted to its rear end. A tubular bearing member 180revolubly mounted on cylindrical bearing 180 forms the hub of a quadrantwhich has a slotted arm 187 secured in adjusted position by a set screw188 passing through the slot and engaging a projection 189 on bearing180. Another arm 190 carried by tubular bearing 186 at its rear end isprovided with a radial slot 191 having an inwardly projecting flange192. Stud 193 has a flange 194 resting against the outer face of arm 190and a nut 195 screwed on the inner end of stud 193 and having a flangedhead engaging flange 192 clamps flange 194 upon arm 190 and so holdsstud 193 in position adjustably toward and from the center of shaft 122.The stud carries a sleeve 196 to which a pinion 197 engaging gear 182and pinion 198 engaging gear 185, separated by washer 199, are keyed andheld against endwise displacement by washer and nut 200 screwed on therear end of stud 193.

The gearing just described provides means additional to the adjustablelatch mechanism described in connection with the indexing mechanism forvarying the speed of rotation of the blank arbor in relation to t-hespeed of its driving member. The ratio of movement of shaft 184 to thatof shaft 122 may be changed by removing pinion 198 and gear 185 andreplacing them with geared members of different sizes, quadrant- 186being shifted angularly to bring said gears into proper engagement. Inmaking this gear change no alteration of the position of stud 193 isnecessary since pinion 197 remains in proper engagement with gear 182 asthe quadrant is moved. To elect changes in the gear ratio beyond therange permitted by changing the two gears mentioned, gear 182 and pinion197 may also be changed, the stud carrying the pinion being adjusted inits slot to bring the new pinion 197 into proper engagement with gear182. Either or both of these changes may be made at the same time andevidently a very wide variation in speeds may be obtained by this changespeed gearing proper, and this range is further increased by the varyingindexing movement secured by the adjustable latch mechanism.

Indexing countershaft 184 carries a bevel gear 201 which engages asimilar gear 202. The bevel gears are inclosed in a gear box 204 whichis mounted to swing in relation to shaft 184 and the machine by means ofsleeves 205 which extend from the box to the front and rear and alsoprovide bearings for the shaft. The sleeves are in turn mounted in thearms of bracket 183 which rest against the hub of the gear box andprevent it from longitudinal movement. Gear box 204 also has an upwardlyprojecting sleeve 206 in which is revolubly mounted a spindle 207 whichhas a flange 208 resting upon the upper end of the sleeve. The lower endof the spindle is formed into a st-ud 209 to which bevel gear 202 ispinned.

Numeral 210 designates the indexing worm shaft, the lower end of whichrests in the bore of spindle 207. The spindle is split for a distance atthe upper end and by means of a nut 211 may be constricted upon the wormshaft. The shaft is provided with a knurled flange 212 by which it maybe rotated when nut 211 is loosened to adjust the angular position ofthe blank arbor without rotating shaft 184 or other driving parts.

The blank arbor carrier 0r saddle 213 has flanges 214, 215, engaging therear and front edges of guide rails 216, 217, on blank column 2. Thesaddle is also provided with an adjustable gib 218 held in position by aflange 219. Clamps 220 are secured to the saddle by set screws 221 andengage the guide rails, preventing the saddle from moving away from thecolumn. The saddle also has a lug v.222 movable within recess 223 formedin the Vcolumn and internally screw-threaded to form a nut engaged byscrew 224 provided with hand wheel-225 by which the spindle is raisedand lowered on the column. When the saddle is properly adjustedvertically it is prevented from movement by tightening screws 221a whichpass through the saddle from the left side (see Fig. 8) and engageclamps 220, thereby causing the clamps to engage the guide rails.

Sleeve 225a forming a part of the saddle carries the arbor-spindle 226revolubly in bearing sleeves 227, 228. The spindle is tapered at itsforward end, bearing sleeve 228 being correspondingly tapered to receiveit, and the spindle is adjusted for wear by means of nuts 229screw-threaded onrthe spindle and resting against the rear flange ofbearing member 227. Spindle 226 is bored all the way through and has aconical counter-bore 230 on its forward end in which the tapered end ofthe work-arbor 231 rests. The arbor is secured in the spindle by screw232 which has a fla-nge 233 resting against the rear end of the spindleand the hand wheel 234 by which it is set up. The indexing worm-wheel235 is secured to the tapered end 236 of the spindle by a key and nut237. This nut also has an inwardly extending flange 238 resting againstthe rear face of flange 233 on screw 232. This serves to take up thereaction of flange 233 when screw 232 is rotated left-handedly to freethe arbor from the spindle.

1Worm-shaft 210 has a longitudinal keyway and carries indexing worm 239which has an internal spline engaging t-he keyway so that it is movablelongitudinally on the shaft but rotates with it. The worm engagesworm-wheel 235 and when driven index-shaft 122 rotates, the worm isrotated and revolves the blank arbor in a manner which will beunderstood from the foregoing description of the parts.

1t is desirable to provide ready means for freeing the worm from theworm-wheel so that the blank may be rotated through considerable arcswithout the trouble of moving all of the indexing mechanism and also sothat the angular position of the wormwheel may be shifted in relation tothe worm one tooth space or more, as may be desired. For this purposesaddle 213 carries a bracket 240 slotted at 241. A rectangulartrunnion-block 242 mounted in the slot has an outer flange 243 engagingthe forward face of the bracket. The block also has an arm 244 extendingto the right hand end of the bracket where it is slotted at 245. In slot245 rests a flanged nut 246thro-ugh which passes a screw 247 of whichthe inner end is secured in the bracket. Worm housing 248 has a trunnion249 entering the bore in the trunnion block and a -flange 250 engagingthe rear face of bracket 240. A

screw 251, nut 252 and washer 253 serve to draw flanges 250 and 243together upon the bracket when desired. rIhe worm housing surrounds theworm and at its lower end is formed into a sleeve 254e forming a bearingfor the worm shaft and at its upper to another sleeve 255 in which isinserted a bush 256 forming an upper bearing for the worm-shaft. Theinner end of the sleeve rests against the worm, and screws 257 passingthrough flange 258 on the bearing sleeve and engaging the housing serveto urge the bearing sleeve against the worm and hold the latter securelyagainst longitudinal movement in the housing.

To free the worm from the worm-wheel, supposing the parts to be in theposition shown, nut 252 is loosened, freeing flanges 243 and 250 fromthe bracket and nut 2&6 is rotated so as to draw trunnion block 242 andwith it housing 2&8 and the worm away from the worm-wheel until thethreads of the worm are freed from the teeth of the gear. During thismovement the trunnion rotates slightly in its block and the necessarymovementl of the worm-shaft around t-he center of shaft 184i ispermitted by rotation of the sleeves 205 of gear box 204 in brackets 183and on shaft 184. rIhe blank arbor may now be freely turned to thedesired position. Reverse movement of nut 246 brings the worm again inengagement with the worm-wheel, movement of the trunnion-block and otherparts being stopped at an adjustable point by screw 250 passing througharm 241i encountering the end of bracket 240. Lock nut 260 secures thescrew in adjusted position.

It is necessary in adjusting the cutter slide frequently to rotate thef-eed screw by hand. rIhis I conveniently do by means of a crank appliedto the forward end of the screw. It is highly important, to permit easyreversing of the screw, to keep its moment of inertia as low as possibleand for this reason I provide a crank normally free on the shaft as willnow be described.

59a is the crank arm whose hub 59b is revolubly mounted on the end offeed-shaft 50. 'Io the rear of the hub a circular ratchet 59c is keyedto the shaft. Crank arm 59l carries a lug 59d through which plunger 59epasses. The plunger has at its inner end a too-th 50E adapted to engagethe ratchet and at its outer end a collar 59g urged outwardly by aspring 59h confined between the collar and the lug. rIhe outer end ofthe crank arm is forked and the handle 59i is pivoted in the fork. itthe inner end the handle has a projection 50k overlying the end ofplunger 59e. Normally, tooth 50f is free from the ratchet and the cranksimply hangs from the shaft which rotates freely within the crank hub.In order to rotate the shaft by hand, handle 59i is urged outwardlywhich brings the tooth into engagement with the ratchet and the crankbeing then rotated the shaft and the feed screw is revolved as desired.As soon as the handle is released the parts return to normal disengagedposition.

I claim:

l. In a. machine tool, a tool-slide, a feedshaft carrying a screwengaging the slide, a drive-shaft in transverse relation to thefeed-shaft, a .worm-wheel revo-luble on the feed-shaft, a worm-shaftparallel with the drive-shaft carrying a worm engaging the worm-wheel,changeablegears connecting the drive-shaft and worm-shaft, aretracting-gear revoluble on the feed-shaft, an intermediate shaftconnected with the driveshaft by bevel-gears, and gearing connecting theretracting-gear with the intermediate shaft.

2. In a machine tool, a tool-slide, a feedshaft carrying a screwengaging the slide, a drive-shaft in transverse relation to thefeed-shaft, a worm-wheel revoluble on the feed-shaft, a worm-shaftparallel with the drive-shaft carrying' a worm engaging the worm-wheel,changeable-gears connecting the drive-shaft and worm-shaft, aretracting-gear revoluble on the feed-shaft, an intermediate shaftconnected with the driveshaft by bevel-gears, gearing connecting theretracting-gear with the intermediate shaft, clutch-members for theworm-wheel and retracting-gear, and a sliding clutch-member revolublyconnected with the feed-shaft adapted to engage the worm-wheel orretracting-gear clutch-members.

3. In a machine tool, a. tool-slide, a rotary tool thereon, a feed-shaftcarrying a screw engaging the slide, a drive-shaft in transverserelation to the feed-shaft, a worm-wheel revoluble on the feed-shaft, aworm-shaft parallel with the drive-shaft carrying a vworm engaging theworm-wheel, changeable-gears connecting the drive-shaft and worm-shaft,a rctracting-gear revoluble on the feed-shaft, an intermediate shaftconnected with the drive-shaft by bevel-gears,

`gearimg' connecting the retracting-gear with the intermediate shaft, atool-drive shaft parallel to the feed-shaft connected to rotate the tooland permit, movement of the slide, and gearing connecting the tool-driveshaft with the intermediate shaft.

4. In a machine tool, a tool-slide, a rotary tool thereon, a feed-shaftcarrying a screw engaging the slide, a drive-shaft in transverserelation to the feed-shaft, a .wormwheel revoluble on the feed-shaft, awormshaft parallel with the drive-shaft carrying a worm engaging theworm-wheel, changeable-gears connecting the drive-shaft and worm-shaft,a retracting-gear revoluble on the feed-shaft, an intermediate shaftconnected with the drive-shaft by bevel-gears,

gearing connecting the retracting-gear With the intermediate shaft, atool-drive shaft parallel to the feed-shaft connected to rotate the tooland permit movement of the slide, gearing connecting the tool-driveshaft With the intermediate shaft, an indeX-drive-shaft parallel withthe feed-shaft, and gearing connecting the indeX-drive-shaft With theintermediate shaft.

5. The combination of a tool slide, reversible driving means therefor, alever co ntrolling said driving means, a rocker movably mounted inrelation to the lever, a tappet. rod connected to the rocker and adaptedto be moved by the slide, indexing mechanism comprising a. driven diskprovided with a notch, a dog adapted to engage the notch, a bell crankconnecting the dog operatively with the tappet rod, a safety stopcoperating with the lever, and a connect-ion between the safety stop andthe dog.

6. In a gear cutter or similar machine, the combination of a feed boX, areversing lever therein, a safety stop adapted to engage the lever, aspring urging the stop to disengagement, a rock shaft having an armengaging the stop for actuating the same, a cutter slide controlled bysaid lever, indexing mechanism comprising a driven disk having a notch,a dog mounted on the rock shaft and adapted to engage the notch, andoperative connections between the cutter slide and the dog.

ARISTIDES REYNOLDS MURRAY.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents,

Washington, D. C.

